Business Buyer Due Diligence Checklist and Document Request List

Due diligence is a claim-testing process. The listing, confidential information memorandum, seller interview, and financial statements contain claims about earnings, assets, customers, employees, contracts, and the transition. The buyer's job is to connect each material claim to evidence and record what remains unresolved.

Use the free Business Buyer Due-Diligence Kit for the printable checklists and document request list that accompany this guide.

Start with a claim ledger

Create one row for every fact that affects price, financing, or the decision to close. Record the claim, source, requested evidence, status, discrepancy, owner, and deadline.

Examples include:

• Revenue and normalized earnings.
• Proposed add-backs.
• Customer concentration and retention.
• Employee pay and responsibilities.
• Equipment ownership and condition.
• Lease terms and assignment.
• Required licenses and permits.
• Seller transition obligations.

This prevents a common failure: collecting hundreds of files while losing track of the questions they were supposed to answer.

Financial records

Request enough history to see the trend and reconcile the story. The exact period depends on the business and transaction, but the review commonly includes:

• Federal, state, and local tax returns.
• Year-to-date and historical income statements and balance sheets.
• General ledger and trial balance.
• Bank and merchant-processor statements.
• Accounts-receivable and accounts-payable aging.
• Payroll registers and tax filings.
• Debt schedules.
• Capital-expenditure history.
• Inventory records.
• Owner compensation and related-party transactions.

Tie revenue to external evidence. Reconcile earnings to the tax returns and explain differences. Rebuild each add-back. Identify cash expenses, deferred maintenance, working-capital needs, and costs that appear after the seller leaves.

Use the SDE and add-back calculator to preserve the bridge between reported and normalized earnings.

Revenue and customers

Revenue quality can matter more than revenue size. Review customer concentration, repeat behavior, contract terms, pricing, gross margin, refunds, discounts, cancellations, and the seller's personal involvement.

For major customers, determine:

• Whether a written contract exists.
• Whether it can be assigned or terminated.
• Who owns the relationship.
• Whether pricing is current and profitable.
• Whether the customer has reduced orders or raised unresolved complaints.
• What the business loses if the relationship ends.

Do not contact customers without the seller's permission and a controlled plan. Confidentiality and deal risk need to be managed.

Employees and contractors

Build a roster showing role, tenure, compensation, classification, benefits, schedule, accrued obligations, reporting line, and importance to the transition. Compare the roster with payroll and tax records.

Identify work currently performed by the owner or family members. If the buyer cannot absorb that work, include the replacement cost in normalized earnings. Review employment agreements, restrictive covenants, commission plans, bonus commitments, disputes, workers' compensation history, and contractor classification with qualified advisers.

Operations and technology

Map how the business receives work, prices it, delivers it, bills it, collects cash, handles complaints, and measures quality. Request procedures, training materials, vendor lists, system inventories, access-control records, backup practices, and material service agreements.

Look for single points of failure:

• One person controls a critical process.
• One vendor supplies an irreplaceable input.
• One unsupported application holds the operating history.
• Passwords belong to the seller personally.
• No tested backup exists.
• A required process is undocumented.

The transition plan should name how each dependency transfers.

Assets, inventory, and facilities

Reconcile the asset list to what is present and what the seller owns. Inspect material equipment and vehicles. Review maintenance records, warranties, liens, leases, serial numbers, and near-term replacement needs.

For inventory, define what is included, how it will be counted, how obsolete or damaged items are treated, and how the final price adjusts. For leased premises, review assignment rights, renewal options, rent changes, personal guarantees, maintenance obligations, use restrictions, and landlord approval.

Legal, tax, and regulatory matters

Acquisition counsel and tax advisers should tailor this review. Relevant items may include:

• Entity records and ownership authority.
• Litigation, claims, investigations, and settlements.
• Liens and security interests.
• Material contracts and change-of-control provisions.
• Licenses, permits, inspections, and renewals.
• Intellectual-property ownership and licenses.
• Privacy, security, and record-retention obligations.
• Sales, payroll, income, property, and franchise taxes.
• Environmental matters.
• Insurance policies, exclusions, and claims history.

Absence from a seller's disclosure is not proof that an obligation does not exist. Verify material items with the appropriate records and professionals.

Financing and sources and uses

Update the complete sources-and-uses statement as diligence changes the deal. Include purchase price, inventory, working capital, fees, taxes, closing costs, repairs, and transition spending. Confirm where every dollar comes from and when it must be available.

Recalculate debt coverage using normalized earnings and realistic owner pay. If the financing depends on a seller note, landlord consent, appraisal, valuation, or third-party approval, track that condition explicitly.

Closing readiness

Before authorizing closing, reconcile the final documents to the approved deal. Confirm:

• Purchase agreement and schedules are complete.
• Closing statement matches sources and uses.
• Required consents and approvals are obtained.
• Liens will be released or addressed.
• Insurance is effective.
• Payroll and banking transitions are ready.
• Keys, credentials, records, domains, phone numbers, and systems will transfer.
• Employees, customers, and vendors have a communication plan.
• The seller's training obligations are scheduled.
• Open diligence items have an owner and written treatment.

An unresolved item can be accepted, priced, escrowed, insured, made a closing condition, or used as a reason to stop. It should not disappear because the closing date is near.

The stop rule

Pause when a material claim cannot be supported, records conflict without a credible reconciliation, access is repeatedly withheld, the financing model no longer works, or the transition depends on cooperation the documents do not require.

Walking away after good diligence is not wasted work. It is one of the outcomes the process is designed to produce.